Add gauge transformation for iPEPS and its CTMRGEnv #320
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Of course, there are some immediate generalizations to handle gauge freedoms in InfiniteSquareNetwork and its CTMRGEnv. But they'd better be added when someone encounters them in concrete applications. For now the only usage in my mind is BP gauge fixing for iPEPS norm network; after the fixing it is natural to transform its CTMRGEnv accordingly. |
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This PR adds a utility function
gauge_transformfor iPEPS and its CTMRGEnv, which transforms the iPEPS or its environment using the gauge matricesXXinv(e.g., produced by BP gauge fixing) on the virtual bonds of the iPEPS.It is tested by checking that the (1-site) reduced density matrices constructed from CTMRG are unchanged after an arbitrary gauge transformation.